11-02-2012, 03:08 PM
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I will have to respectfully disagree when it comes to having a canopy.
Even if you don't have a fish that's known for jumping, I would initially cover the tank no matter what. All fish will jump when stressed out or "running" from danger. Until you can confirm all your fish are compatible (well behaved) there is a possibility of a jumper.
I came across the problem when my larger clownfish would chase the male away from food. Sadly I was on vacation and he jumped out a small 3" gap for my autofeeder.
Just my two cents,